G. NEADS Lines Leak Check
SUBTASK 47-00-00-790-015
(1) Do an inspection of the NEADS lines from the ASM to the flame arrestor at the fuel tank rear
spar for damage and leaks (TASK 28-22-15-700-801).
47-AWL-07: ALI
(a) Make sure there are no loose clamps for the NEADS couplings, drain line connections or
joints.
NOTE: ALI - Refer to the task: Airworthiness Limitation Precautions,
TASK 47-00-00-910-802, for important information on airworthiness limitation
instructions (ALIs).
NOTE: This is applicable to Airworthiness Limitation 47-AWL-07.
47-AWL-07: ALI
(b) Make sure there are no disconnections for the NEADS couplings, drain line connections
or joints.
NOTE: ALI - Refer to the task: Airworthiness Limitation Precautions,
TASK 47-00-00-910-802, for important information on airworthiness limitation
instructions (ALIs).
NOTE: This is applicable to Airworthiness Limitation 47-AWL-07.
47-AWL-07: ALI
(c) Make sure there are no damaged tubes from the ASM to the fuel tank rear spar.
NOTE: ALI - Refer to the task: Airworthiness Limitation Precautions,
TASK 47-00-00-910-802, for important information on airworthiness limitation
instructions (ALIs).
NOTE: This is applicable to Airworthiness Limitation 47-AWL-07.
SUBTASK 47-00-00-790-016
(2) Do these steps to do a check for leaks in the NEADS lines between the ASM and the flame
arrestor at the rear spar.
(a) Apply a small quantity of leak detector, G50135, to the applicable coupling or drain line
connection.
(b) Examine the NEADS coupling or connection for a leak.
(c) No air leaks are permitted.
(d) Use a clean cotton wiper, G00034, to remove the leak detector, G50135.
SUBTASK 47-00-00-790-017
WARNING
DO NOT DISCONNECT THE COMPONENTS OF THE NITROGEN
GENERATION SYSTEM, OR DUCTS WHEN THE SYSTEM IS PRESSURIZED.
THE HOT, HIGH-PRESSURE AIR CAN CAUSE INJURIES TO PERSONNEL,
AND DAMAGE TO EQUIPMENT.
WARNING
WHEN YOU DO A TEST OF THE SYSTEM, MAKE SURE THAT THERE IS
SUFFICIENT AIRFLOW IN THE AREA. USE LIFE SUPPORT EQUIPMENT IF
YOU THINK THAT THERE IS A HIGH NITROGEN CONCENTRATION. LOW
OXYGEN LEVELS IN THE AIR ARE DANGEROUS TO PERSONNEL.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-00-00
Page 615
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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